No Sound on Dell Optiplex with Soundmax audio

i am totally new to this and am not a computer whizz at all..i need help with my dell optiplex gx280...when trying to litens to music or watch anything i do not have any sound at all..i went into control panel and nothing is muted is says my default sound devixe is Soundmax digital audio, i also pressed f2 when the dell screen came up to check that BIOS but i couldnt change anything and i was unsure if i needed to do anything with it..its really bugging me now have no sound and wondered if there is anything i could do via the computer or shall i jsut go and buy speakers!!??

Take the computer to a friend that understands how to troubleshoot computer problems. We can't stand beside you and see for ourselves what the problem is caused by. You have to be able to understand what we ask you to do...